During World War II, Jack Weston is an Army private in prime physical condition who dons a patriotic costume and becomes the Minute-Man, a "One Man Army" who combats enemy agents. His double identity is known to his superior officer General Milton, who sends the Minute-Man on unsanctioned missions behind enemy lines. Minute-Man serves as a member of a group of local Fawcett City heroes, the Crime Crusaders Club.

Prior to DC Comics' Crisis on Infinite Earths miniseries, Minute-Man was said to exist on the parallel Earth-S, home of the Fawcett heroes. He makes his first appearance in Shazam! when he rescues Billy from Mr. Mind and the Rainbow Squad, who have captured and gagged him. Cap feels unable to fight females, so Minute-Man shows him he can do it, inspiring Cap to beat the Squad, and reveal their leader Mr. Wonderful is really his old enemy, the super-intelligent alien worm Mr. Mind. In this incarnation, the character was also a member of the Squadron of Justice, a team of Fawcett characters who joined forces with the Justice League and Justice Society. He was incorporated into the mainstream DC Universe in the wake of the Crisis.

In the new timeline, Weston defends Fawcett City for time following the war with his fellow heroes. Eventually retiring from costumed heroism, he is shown to have become a government agent in the Power of Shazam! series, serving as an occasional ally to Captain Marvel.

In Justice Society of America (vol.3) #3, Jack Weston (mistakenly referred to as Jack Burton), his children and grandchildren are killed in their sleep by an unknown assassin in their home in Clearwater, Florida. Minute-Man was one of three patriotic superhero bloodlines destroyed by the efforts of Vandal Savage, alongside with the bloodlines of Mr. America, Commander Steel and General Glory. Savage wished to stop the prevalence of relatives taking on the heroic identities and/or powers of their loved ones.